Aromatic isonitrile pest controlling agents



United States Patent poration No Drawing. Filed Dec. 3, 1963, Ser. No. 327,824

Claims priority, application Germany, Dec. 17, 1962,

US. or. 424226 15 Claims Int. Cl. A0111 9/20 The present invention concerns the use of aromatic isonitriles, some of which are novel, for controlling pests.

It has already been disclosed that aliphatic and araliphatic isonitriles with 1325 carbon atoms can be used as insecticides (US. Patent No. 3,012,932).

It has now been found that aromatic isonitriles of the eneral formula wherein A denotes an optionally substituted aromatic radical, exhibit strong biocidal properties and can for this reason be employed as pest control agents.

It is distinctly surprising that the compounds according to the invention should exhibit biocidal activities which are appreciably more intensive and also more diverse than those of the aliphatic and araliphatic isonitriles with 13-25 carbon atoms which are at present known in technology and which merely exhibit insecticidal properties. Thus, a 0.2% solution of 2-methyl-3- chloro-phenyl isocya-nide according to the invention has a 100% systemic activity towards Sitobium granarium after it has acted for 24 hours whereas the-previously known n-octadecyl isocyanide does not exhibit any activity whatever.

The compounds to be employed according to the invention are clearly characterised by the above Formula I. The term aromatic radicals within the scope of the invention applies not only to those aromatic radicals which are built up exclusively from a carbon skeleton but also to these aromatic radicals which contain heteroatoms.

In Formula I,'A preferably denotes phenyl, naphthyl, phenanthrenyl, pyridyl, pyrimidyl, quin'olyl', indolyl, diphenylene-oxide, tetralyl, and dibenzofuranyl radicals.

The aromatic radicals may also be substituted. They preferably contain 1 to substituents from the following groups:

Alkyl and cycloalkyl radicals with 1 to 12 carbon atoms, hydroxyl groups, alkoxy, aryloxy, alkylmercapto, arylrnercapto, alkylcarboxy, arylcarboxy, carboxylic acid ester, carboxylic acid amide, urethane, sulphone, sulphenamide, nit-r0, trifluoro-methyl, polyhalobicyclo-phenyl, arylazo, and nitr'ile; groups. In addition, the aromatic radicals may also be substituted by halogen atoms, preferably chlorine and bromine.

The following may be detailed as examples for the compounds according to the invention:

2,6-dimethyl-phenyl, 2,6-diisopropyl-phenyl,

mesityl,

2,6-diethyl-4-methyl-phenyl, 2-methyl-3 chloro-phenyl, 6-chloro-phenyl, 2-methyl-4-chloro-6-ethyl-pheny1, 2,4,5-trichloro-phenyl, 2,4-dimethoxy-phenyl,

2,5- and 3,4-dimethoxy-phenyl, 2,4-dimethoxy-5-chloro-phenyl, 2 methoxy-S-ethylsulphonyl-phenyl, 2-methoxy-5-phenylsulphonyl-phenyl, 2-m'ethoxy-5-(di-N,N-n-butyl-sulphonamide) -phenyl, 3methyl-4-diphenylyl, 2,3- and 3,4-tetramethylene-phenyl,

3 and 4-n'itro-phenyl, 3-nitro-4,G-dimethyl-phenyl, Z-methoxy-S-nitrophenyl, 2-hydroxy-3-nitro-5-chloro-phenyl, 2-methoxy-4 nitro-phenyl, 4-carbethoxy-phenyl, 2-methyl-3-nitro-pheriyl,

aand fi-naphthyl, 3-benzoyl-phenyl,

3 -methoxy-diphenyl-oxide- (2) 1,2,4-triazolyl-(4),

ANH-CHO (11) wherein A has the same significance as stated above, with water-eliminating agents in the presence of bases. During this process, the formylamides are converted to the isonitriles by means of the elimination of water.

The starting materials required for the preparation of the aromatic isonitriles according to the invention are precisely characterised by Formula II. Some of these are again novel. Such formamides may however be prepared simply according to known methods by heating the corresponding known amines with formic acid under reflux for 1 to 10. hours. The formamides' already crystallise on cooling. If this does not happen, the reaction solution is concentrated somewhat until crystallisation occurs. The

crystals are filtered off -with suction, dried thoroughly,

and finely powdered. They can be employed in this form for the preparation of the aromatic isonitriles according to the invention.

Characteristic amine pre-precursors may be found, for

' instance, in Beilstein, vol. 16, page 344, 1933, and also in US. Patent 2,673,172.

Hydrocarbons, for instance benzene and benzine, chlorinated hydrocarbons such as methylene chloride,ethers such as dioxane, and esters such as ethyl acetate may be employed as solvents during the preparation of the iso- The tests were carried out by the usual method. The nitriles according to the invention. Phosgene is mainly required aqueous suspensions are prepared by taking up employed as the Water-eliminating agent, but other acid the active agent in about its own Weight of dimethylchlorides such as phosphorus oxychloride, benzene-sulformamlde, adding a little of the emulsifying agent, and phonyl chloride, and cyanuric chloride may also be used. dilutlng this concentrate to the desired concentrations.

TABLE 1 Common fly Mosquitoes Grain weevils Fly maggots Mosquito larvae Musca domestica Aedes aegypti Cala'ndra qra'narza Musca domestzca Aedes aepyptt lerve '1 Isonitne Conc. TL100 Cone. TLIOO Gone. Activity Cone. Activity Cone. Activity (percent) (percent) (percent) (percent) (percent) (percent) (percent) (percent) ZA-dimethoxy-phenyl 0.1

2,5-dlmethyoxy-phenyl 2-methoxy-5-chlorophenyL- 2,6dimethylphenyl 2-methyl-3-chlorophenyl 3-methyl-t-cyelohexylphenyl Pyridine, triethylamine, or potassium tert. butoxide are conveniently selected as the bases. TABLE 2 The reactlon temperatures between 0 and 100 C" (1) Activity of aromatic monoisonitriles towards Tetnmychita' Marius preferably between 0 and C. (green, resistant,-percent'destruction) The aromatic isonitriles are obtained in a particularly simple manner when the corresponding aryl-formamides Concentration v are first introduced together withtriethylamine in methylin ene chloride, and phosgene is then passed into this mix- Isonimla cidal' ture. In order to work up the reaction mixture, it is treat- 2,000 200 20 ed with Water, the organic phase is separated, and it is then subjected to a vacuum distillation. Representative 0 examples for the production of the novel aromatic iso a nitriles have been given among the examples of .prtepara- Q NC 100 95 0 tion. In addition, examples for'the production of arylformamides have also been given there. OOH: The aromatic isonitriles according to the invention have strong biocidal properties. They are particularly suitable I [for application as insecticides, nematocides, acaricides, 40 100 go and fungicides. Thus, they are for instance effective towards insects such as flies, mosquitoes, beetles, and 'greenflies, and towards mites and nematodes. O The following may be mentioned as example of insects which can be controlled with the substances according" to the invention: 7 100 V 0 0 A Greenflies of the species Myz'odes persicae' and Daralis fabae, flies of the species Musca domestica and Drewphila melalnogaster, as well as the Colorado'beetle (Leptinotarsa decem'lineatiz), ampher beetles (Gastrophysa virz'dula), Oriental cockroaches (Per'z'planeta orientalis),

and crickets (Gryllus domesticus). 01- o' 100 40 0 Tetranychus telarius may be mentioned as a representa- COsCH:

tive of the mites, and Meloidogyne 'zlncognita as a repre- NC sentative of the nematodes.

Their fungicidal activity in particular extends to phyto- C 100 100 0 pathogenic fungi, for instance Rhizoctonia solani.

The compounds according to the invention may be applied by themselves or as compositions made up by the normal method. The compositions may be suspensions, dispersions, powders, or dusting powders. They are prepared by the usual method with the aid of the normal (2) fiiifigtfis l imalh extenders, diluents, and emulsifying agents.

The biocidal properties of the aryl isocyanides according to the invention are reproduced below by reference Isonitrile io ifjfiffig 1 2323 to some examples. Thus, 0.2% aqueous solutions of 2,6- dimethyl-phenyl isocyanide and 3-methyl-2-chloro-phenyl 10% 3% 1% isocyanide cause 100% destruction of flies of the species D r0s0plhila melanogaster Within 24 hours.

When applied at a concentration of 0.05%, 2,4,5-tri- Q- I chloro-phenyl isocyanide reduces the infestation of Piricularia orycae on rice to 25% of the infestation on an untreated control. I p I l The following Table 1 specifies the activit of 6 aro- Q- I matic isonitriles according to the invention towards inl sects.

TABLE 2Continued Dry dressing, isonitrile Iso'nitrile content as percent" arm-@410 I I O CH:

CH; 01186400 I OaN OCH:

OxN

OzOHs om NC I III (3) Activity of aromatic mongieonitriles towarde grain weevils (percent estruction) TABLE 2 -Continued (4)"A'oth 7itf0f aroni'ati nioi loisonitriles towards-mosquito *lervae (percent dstrution) Concentration in percent Isonitriie I ARTE! OCH:

LNG

(5) Xctivi'ty 'of eronmticisonitriles'towerds Oriental cockroaches (percent destruction) Concentration, percent Isonitrile (6) Systemiceetivity of aromatic monoisonitriles towards Rhobuloaiphon spec. (percent destruction) Isonitrile Concentration; percent (7) Actiw ity of aromatic monoisonitriles towards M. pe1eivae'-(percent destruction) Concentration,

percent Isonitrile 0H.- I-NC 100 00 CHO I 100 -50 -NO 20 -c1-- NO 100 so CH3ON c 5 20 TABLE 2-Continued TABLE 2-Contimled (8) Activity of aromatic monoisonitriies towards Plutella maculipennis (10) Activity of aromatic monoisonitriies towards Botn tis cinerera (percent destruction) (separated leaves) Concentration, 5 CH; Percent Feed Isonitriie deterrent O 2 0 02 efiect (3113- NC I No infestation at 1 p.p.m.

N02 cmoQ-tro 100 30 10 OCH:

CHzO

100 90 (11) Activity of aromatic monoisonitriles towards Piricularia crycae (percent; infestation; untreated controi=100%) l OOHa I 0.05% 0.1% CH3 I Isomtnle Spray Dusting liquor agent (0) Activity of aromatic monoisonitriles towards Drosophila concentmgmn (12) Activity of aromatic monoisonitriles towards Phytophthora infestans percen (percent infestation) Isonitriie 0. 2 0. 02 Concentration I inp.pim.

I Isonitnie 100 0 250 62 31 OzN C1 7 l V V. V V 0=NNc 100 0 4 CHaO-NC 12 54 (EH3 OCH;

5o CH3 C 26 44 (13) Activity of aromatic monoisonitriies towards Eryaiplle spec. (on 0 CH3 cucumbers, percent inlestation) Concentration,

p.p.m. Compar- 0 Inc 0 Isonitriie ison with standard 250 62 O CH:

NC 100 V 0 C1 01 01 CL 100 0 NC 3,422,190 9' TABLE 2-Gontinued (14) Pungicidal and fungistatic activity of aromatic monoisonitx ilosrtowardsrdiseawcausing organisms living in seeds and the soil (agar-agar plate test; inhibition oi mycelium growth at the concentrations expressed in p.p.m.).

OgN

OnN-Q-NC 100 100 100 1100 100 I00 100 I00 QNC 100 100 100 100 100 I00 I00 100 OsN ' QNC 100 100 100 100 100 100 100 100 000K.

OzN

I V CHr-QNC 10 100 100 10 10 100 100 100 NO; OIL-QM) 10 1o 10 10 10 100 100 100 01 OCH;

QNC 100 100 100--100l" 100 100 100 100 TABLE 2C0ntinued E e E 3 E "-5 5] e. s 5 55 8'5. 5 5% 5? Isonltrllo g: gs pg 50 o a 53 3Q 53 E a; 5 E? T: E"? is $2 :5 532 5 27 o 0 s n a 4 I Cl o1-Qo-Q 10 100 100 100 10 100 100 100 Toxicity o( aromatic monolsonitriles towards warm-blooded creatures.

Largest dose which wassurvlved'ifl TABLE 2Continued mgJkg. (mouse) Compound Peroral Subouta- Largest dose which means was survived, in mgJkg. (mouse) OH(CH3): Compound Peroral Subcutaneous NC 100 100 CH: 250 100 40 I NO: I NC 1,000 500 G1 I I N 0 NC 7 5,000 1,000 O! CI 2,000 500 NO3- -CH3 I I NC N C- CH:

C1 NO: 2,000 500 OCH:

I I NC NC OzN- 500 250 5,000 1,000 CH3 CF: I I NC N C CH:

CF; CF: 5, 000 1, 000 NO; 500 1, 000

I CH;

I I 10 NC TABLE 2-C0ntinued Compound O CHI Largest dose which was survived, in m -l u Peroral Subcutaneous TABLE 2-Conti'nued Compound Largest dose which was survived, in mgJkg. (mouse) Peroral Subcuta- 3 1180115 CH GHEI The following. examples are given for the purpose of illustrating the invention.

EXAMPLE 1 I No- 170 parts by weight of Z-methyl-B-ehloro forrnani1ide, 230 pants by weight of tri'ethylamine and 800 parts by weight of methylene chloride are introduced first of all. parts by weight of phosgene are passed in whilst cooling withice and stirring. After 500 parts by weight of water have been added, the product is separated, dried over potassium carbonate, filtered, and distilled" in vacuo. Yield: parts by weightof 2-methyl-3-chloro-pheny1 isocyanide of B.P. 6870 C./0.15 mm. Hg.

EXAMPLE 2 45 partsby Weight of m-nit-ro-formianilide, 25 parts by weight of triethylamine and parts by weight of methylenechloride are introduced first of all. A solution of 27 parts by weight of phosgene in 50 parts by weight of methylene chloride'is added dropwise, whilst cooling with ice-and stirring. It isworked up by adding 200' parts by weight of water, separating, and evaporation. in vacuo at 20-30 C, Yield: 38 parts by weight of m-nitro-phenyl isocyanide, M.P. 72-75 The m-nitro-formanili powder.

de' employed as the starting material. is prepared by boiling m-nitraniline with formic acid for several hours, concentrating" the reaction solution, and allowing it to cool, The precipitated crystals are filtered oif with suction, dried thoroughly, and reducedto a fi ne EXAMPLE 3 1 EXAMPLE 4 O C II;

( lHao 57 parts by weight of phosgene are passed into a mixture of 103 parts by weight of 2,5-dimethoxy-formanilide, 135 parts by weight of triethylamine and 500 parts by weight of methylene chloride, whilst stirring and cooling with ice. It is treated with water, the organic'phase is separated, evaporated in vacuo at 20-30 C., and the residue is recrystallised from ligroin. Yield: 60 parts by weight of 2,5-dimethoxy-phenyl isocyanide. M.P. 646'5 C.

2,5-dimethoxy-formanilide is prepared by boiling 2,5-

.dimethoxy-aniline with formic acid for several hours. The

desired product separates on cooling. Its melting point is 77 to 79 C.

EXAMPLE 5 oN -oom EXAMPLE 6 60 parts by weight of ethyl-(3-formylamino-4-methloxyphenyD-sulphone, 60 parts by weight of triethylarnine and 200 parts by weight of methylene chloride are introduced first of all. 25 parts by weight of phosgene, as a solution in 40 parts by weight of methylene chloride, are added dropwise at 0-15 C. whilst stirring. It is advisable to carry out the dropwise addition with the aid of a dropping funnel dipping into the reaction mixture. 150 parts by weight of water are added when the reaction has been completed, the organic phase is separated, dried over anhydrous potassium carbonate, filtered, evaporated in vacuo at 2030 C., and the residue is recrystallisedfrom toluene. Yield: 44 parts by weight of 3-ethylsulphonyl-6- methoxy-phenyl isocyanide. M.P. 106108 C. r

Ethyl (3 fonmylamino 3 methoxy phenyl) sulphone is prepared by boiling the corresponding amine with formic acid for several hours. The productis obtained on concentrating and cooling the reaction solution, in the form of crystals of melting point 137139 C.

EXAMPLE 7 parts by weight of -3-formylamino-4methoxybenzene-sulphonic acid di-n.butylamide, 60 parts by weight of triethylamine and 200 parts by Weight of dry dioxane are introduced first of all. 25 parts by weight of phosgene are passed in at O'15- C., whilst stirring. 200 parts by Weight of a concentrated aqueous solution of sodium carbonate and 200 parts by weight of toluene are added, the product is separated, dried over potassium carbonate, filtered, and evaporated in vacuo at about 30 C. 65 parts by weight of a brown oil remain, which largely 16 consists of 3 isocyano 4 methoxy-benzene-sulphonic acid-di-n.butylamide.

EXAMPLE 8 N NC parts by weight of phosgene are passed into a mixture of parts by Weight of a-pyridyl-formamide, 100 parts by'weight of triethylamine and 250 parts by weight of methylene chloride, the reaction is allowed to go to completion, air is blown through, parts by weight of a concentrated solution of sodium carbonate are added, the organic phase is separated, and it is evaporated in vacuo at 20-30" C. when 59, part by Weight of crude ot-pyridyl isocyanide remain as a brown oil.

u-Pyridyl-for-mamide is prepared by boiling a-aminopyridine with formic acid under reflux for several hours. When the solution has been evaporated and cooled, a liquid of boiling'point 92 to 93 C./0.001 mm. Hg is obtained.

EXAMPLE 9 \O/ OCH:

12.5 parts by weight of phosgene are passed into a mixture of 30 parts by weight of 2 formylamino-3- methoxy-di-phenylene-oxide, 30 parts by weight of triethylamine and 150 parts by weight of methylene chloride. 50 parts by weight of water are added, the organic phase is separated, evaporated in vacuo, and the residue is recrystallised from benzene/benzine. Yield: 14 parts by weight of 2-isocyano-3-methoxy-diphenyleneoxide. M.P. 171173 C. (decomp).

EXAMPLE 10 240 parts by. weight of 2-methyl-4-cyclohexyl-formanilide L(M.P. 132-133 C.), 240 parts by weight of triethylamine and :700 parts by weight of methylene chloride are introduced first of all. 110 parts by weight of phosgene are passed in, the reaction is allowed to go to completion, 500 Eparts by weight of water are added, the organicf phase isseparated and distilled in vacuo at B.P. 100-103 C./0.005 mm. Hg. Yield: parts by Weight of 2-methyl-4-cyelohexyl-phenyl isocyanide.

EXAMPLE 11 100 parts by weight of phosgene are passed at 0-15 C. into a mixture of 175 parts by Weight of a-formylaminotetralin (M.P. 100-102 C.), 230 parts by Weight of triethylarnine, and 1500 parts by weight of methylene chloride, whilst stirring. Water is added, the product is separated and distilled in vacuo. Yield: 146 parts by weight of 2,3-tetramethylene-phenyl isocyanide. B.P. 119123 C./0.02 mm. Hg.

190 parts by weight of 3,4-dichloro-formanilide, 250 parts by weight of triethylamine and 600 parts by weight of methylene chloride are introduced first of all. 100 parts by weight of phosgene are passed in at a sufliciently fast rate for the temperature of the reaction mixture, which is stirred and cooled by means of a bath of ice and common salt, to amount to -15 C. It is subsequently heated at 3040 C. for -15 minutes, a vigorous current of air is then passed through for 5-10 minutes, and it is treated with 1000 parts by weight of ice-water. The organic phase is separated, dried over anhydrous potassium carbonate and evaporated in vacuo at 30 C.

The residue is extracted with petroleum ether and this solution is evaporated in vacuo. Yield: 81 parts by weight of 3,4 dichloro-phenyl isonitrile. M.P. 32-33 C.

When an equivalent amount of other starting products is employed in place of the 190 parts by weight of 3,4- dichloroformanilide but the procedure is otherwise exactly in accordance with the above,directions, the isonitriles specified below are obtained in the stated yields. Certain differences arise during the treatment of the resultant residues. Therefore, details are given of this operation in each case. The structural formula of the product is given first of all, then the treatment of the residue, and finally the yield.

The residue cannot be distilled. Yield: 165 parts by weight of crude 2,3-dichloro-phenyl isocyanide.

QQQ

The residue cannot be distilled. Yield: 166 parts by weight of crude, oily 3,5-dichloro-phenyl isocyanide.

(5) C1 Cl The residue is triturated with ligroin and filtered off with suction. Yield: 255 .parts by weight of pen-tachloro-phenyl isocyanide. M.P. 184-186" C. (decomp.').

The residue is recrystallized from petroleum ether. Yield: 83 parts by weight of 3-methyl-4-chloro-phenyl isonitrile. M.P. 4647 C.

The residue is distilled in vacuo. Yield: 163 parts by weight of 2,4-diisopropyl-phenyl isocyanide. B.P. 71-74 C./ 0.02 mm. Hg.

The residue is distilled in vacuo. Yield: 169 parts by weight of 2,6-diisopropyl-phenyl isocyanide. B.P. -97 C./0.55 mm. Hg.

( O C H:

The residue is distilled in a high vacuum. Yield: 81 parts by weight of Z-methyl-4-methoxy-phenyl isonitrile. B.P. 6869 C./0.001 mm. Hg.

I OCH:

The residue is washed with ether until colourless. Yield: 109 parts by weight of 2-methoxy-4-chloro-phenyl isonitrile. M.P. 9597 C.

| @NC on3 OCH; la;

The residue is washed with ether. Yield: 117 parts by weight of 2-methoxy-4-chloro-5-methyl-phenyl isonitrile.

M.P. 9394 C.

19 parts by weight of 2-rnethoxy-4,5-dichloro-phenyl isonitrile. M.P. 95-96 C.

lie

The residue is recrystallised from ligroin at 70 C. Yield: 156 parts by weight of 2,3,5-trichloro-6-meth0xyphenyl isonitrile. M.P. 93-95 C.

The residue is recrystallised from benzene. Yield: 228 parts by weight of 4,4-dichloro-2-isocyano-diphenyl ether. M.P. 104105 C.

(16) O OH;

The residue is recrystallised from ligroin. Yield: 70 parts by weight of 2,4-dimethoxy-phenyl isocyanide. M.P. 67-

-OCHa I'm The residue is washed with ether. Yield: 154 parts by weight of 2,5-dimethoXy-4-chloro-phenyl isonitrile. M.P.

OzN-G-NC The residue is triturated with ether and filtered 01? with suction. Yield: 120 parts by weight of p-nitro-phenyl isocyanide. M.P. 9597 C.

The residue is recrystallised from ligroin. Yield: 107 parts by weight of Z-methyl-S-nitro-phenyl isonitrile. M.P. 78-

The residue is washed with ether/petroleum ether and recrystallized from ligroin. Yield: 103 parts by weight of 2,4-dimethyl-6-nitro-phenyl isonitrile. M.P. 5052 C.

(22) (I)CH3 ILTC The residue is washed with ether/ petroleum ether. Yield: 123 parts by weight of 2-nitro-4-methoxy-phenyl isonitrile. M.P. 9192 C.

The residue is dissolved in chloroform and precipitated with petroleum ether. Yield: 117 parts by weight of 2- rnethoxy-4-nitro-phenyl isonitrile. M.P. 158-160 C.

The residue is recrystallized from ligroin. Yield: 116 parts by weight of Z-methoxy-S-nitro-phenyl isonitrile. M.P. loo-101 C.

The residue is washed with ether. Yield: 161 parts by weight of Z-methoxy-4-nitro-5-methyl-phenyl isonitrile. Decomp. point 136 C.

OCH3

The residue is thoroughly rinsed with :20 ether/tetrahydrofuran. Yield: 136 parts by weight of 2-methoXy-4- nitro-S-chloro-phenyl isonitrile. M.P. 117-118 C.

CHaO

The residue is recrystallized from toluene. Yield: 186 parts by weight of 2,5-dimethoxy-4-nitro-phenyl isonitrile. Decomp. point 198 C.

The residue is a brown oil which: cannot be distilled.

21 Yield: 123 parts by weight of crude m-cyano-phenyl isocyanide. I

The residue is washed with ether/ petroleum ether. Yield: 119 parts by weight of crude 4-isocyano-benzoic acid ethyl ester. M.P. 88103 C.

OOOCHa I NC The residue is extracted with ether. 78 parts by weight of 2-isocyano-4-nitro-benzoic acid methyl ester remain after evaporation of the ether extracts. M.P. 68-70 C.

The residue is distilled in vacuo. Yield: 133 parts by 0 Weight of a-naphthyl isocyanide. B.P. 110-1 12 C./0.00l

mm. Hg.

( CH(CH3)2 A-NZG wherein A is a member selected from the group consisting of a p-chlorophenoxy-m-chloro-phenyl, p-aZobenzo-omethyl-phenyl, p-cyclohexyl-o-methyl-phenyl, o,p-dimeth yl-o-nitro-phenyl, naphthyl,

and

A being connected to the nitrogen atom from a ring carbon atom. 7

2. A pesticidal composition consisting essentially of a compound of the formula wherein A is a member selected from the group con- 7 sisting of an o chlorophenoxy m chlorophenyl, p-azobenzo-o-methyl-phenyl, o,p-dimethyl-o-nitronhenvl and in combination with at least one member comprising a diluent, extender and emulsifying agent.

3. A method for combating pests which comprises applying to said pests a pesticidal amount of an aromatic isonitrile as defined in claim 1 wherein A is a naphthyl moiety.

4. A method for combating pests which comprises applying to said pests a pesticidal amount of an aromatic isonitrile of the formula I NC 5. A method for combating pests which comprises applying to said pests a pesticidal amount of an aromatic isonitrile of the formula 6. A method for combating pests which comprises applying to said pests a pesticidal amount of an aromatic isonitrile of the formula 7. A method for combating pests which comprises applying to said pests a pesticidal amount of an aromatic isonitrile of the formula 8. A method for combating pests which comprises applying to said pests a pesticidal amount of an aromatic isonitrile of the formula C1 01 mcw cl (:1

9. A method for combating pests which comprises applying to said pests a pesticidal amount of an aromatic isonitrile of the formula CHa- NC 10. A pesticidal composition having as active ingredient a pesticidal quantity of a compound of the formula I NC in combination with at least one member comprising a in cornbinationwith at least one member comprising a diluent, extender, and emulsifying agent. diluent, extender, and emulsifying agent.

11. A pesticidal composition having as active ingredient 15. A pesticidal composition having as active ingredient a pesticidal quantity of a compound of the formula a pesticidal quantity of a compound of the formula in combination with at least one member comprising a 10 CHPQPNO diluent, extender, and emulsifying agent. l

12. A pesticidal composition having as active ingredient a pesticidal quantity of a compound of the formula in combination with at least one member comprising a in combination with at least one member comprising a diluent, extender, and emulsifying agent.

References Cited diluent, extender, and emulsifying agent. UNITED STATES PATENTS 13. A pesticidal composition having as active ingredient 20 3 Bussert a pesticidal quantity of a compound of the formula 3:164:515 1/1965 Homwel. 3,180,890 4/ 1965 Enders et .al. 260"566 H 3,190,918 6/1965 Holtschmidt 260-5 66 2 3,201,443 8/1965 Malz et a1. 260461 H;

OTHER REFERENCES in combination with at least one member comprising a chem Abstracts, 60p, 10557g (abstract of Belgium diluent, extender, and emulsifying agent. 627 486 Ju1y24 1963) 14. A pesticidal composition having as active ingredient a pesticidal quantity of a compound of the formula 30 LEWIS 'GOTTS, Primary Examiner.

C1 C1 S. K. ROSE, Assistant Examiner.

2 C US. Cl. X.R. 

1. A METHOD FOR COMBINING PESTS WHICH COMPRISES CONTACTING SAID PESTS WITH A PESTICIDAL AMOUNT OF A COMPOUND OF THE FORMULA 